Im dating this guy but he is talking to other girls, acceptable?

we are not a couple yet. I dont want to look clingy so im being cool that he is actively chatting with other girls. Is this acceptable?

we are sleeping together and he told me he likes spending time with me and pretty much his schedule is always open for me. He never cancelled on me nor said no if i invite him out. Even if he is talking to others, can i assume im his priority? We dont talk everyday by the way.

That's not a topic to actually argue about. If that turned into an argument he's likely being emotionally abusive and wants to still sleep with you while doing his own thing with these other girls. Don't waste your time trying to get him to change and settle down with you. It's not going to happen. So either leave him and go see other people. Or sleep with him if you still like the sex and go see other people. Just don't wait for him.